Numerical prediction of aerodynamic noise generated from missile for low Mach number flowsReport as inadecuate




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Technical gazette, Vol.24 No.3 June 2017. -

Paper describes numerical prediction of aerodynamic noise generated from the missile. Simulation of turbulent flow is done solving incompressible Navier-Stokes equation, where turbulence is modelled with the orthogonal subgrid scale OSGS method with dynamical subscales. Because of comparison, the same simulation is done using the LES Large Eddy simulation. It is shown how simulation of turbulent flow affects the prediction of acoustic sources calculated using Lighthill-s analogy. Translation from time to frequency domain is done through DFT Direct Fourier Transform, which gives smaller usage of memory. Acoustic sources are used in inhomogeneous Helmholtz equation to simulate pressure wave propagation in the domain. It is shown that OSGS with dynamical subscales gives better representation of the spectrum. Overall, better prediction of energy transfer across large and small eddies will give better allocation and presentation of acoustics sources. These sources will change wave propagation of the pressure in acoustic field.

aeroacoustics; direct Fourier transform; inhomogeneous Helmholtz equation; Litghill’s analogy; noise; orthogonal SGS method with dynamical subscales



Author: Vladimir Jazarević - orcid.org-0000-0002-9882-5822 ; University of Belgrade, Marka Oreškovića 12, 11000 Belgrade, Serbia Bošk

Source: http://hrcak.srce.hr/



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